Diesel particulate filter DDE6.2

For heavy vehicles such as the E60, to comply with the EU4 legislation taking effect as of 2005, a coated diesel particulate filter is necessary.
This diesel particulate filter separates the soot particles in the exhaust gas with high efficiency (> 95 %). The diesel particulate filter has no influence on the nitrogen oxide (NOx) emissions; these are reduced by measures inside the engine.
The particulate filter system used at BMW requires no maintenance and is designed to last the service life of the vehicle. A fuel additive for filter regeneration is not necessary for BMW vehicles.

The diesel particulate filter is fitted close to the engine and is located behind the oxidation catalytic converter in the underbody of the vehicle.
The filter element consists of a ceramic monolith made of silicon carbide that is resistant to high temperatures. The filter element is 50 % porous and has been given a platinum-based, catalytic coating. This coating ensures that the soot ignition temperature is reduced, thus ensuring good regeneration characteristics of the particulate filter.

The total weight of the diesel particulate filter is approx. 7.5 kg.

Changes for the particulate filter system

For the actual function of the diesel particulate filter, the following changes have been added:

• Exhaust system with catalytic coated soot particle filter
  
• Throttle valve for exhaust gas temperature increase within the engine
  
• Two exhaust gas temperature sensors per row for initiating the filter regeneration (Note:) On the M47TÜ2 engine, there is only one exhaust gas temperature sensor - before the particulate filter)
  
• An exhaust backpressure sensor to estimate the filter load while the vehicle is being driven
  
• Extended software of the engine management system
  

New CBS strategy:

With introduction of the new CBS strategy for BMW diesel model (first deployment: in the E70 as of 09/2006), the remaining distance for the particulate filter can be read out via the control unit functions. As the particulate filter is no longer a CBS function, two new faults indicate limited remaining availability:

• Fault 452A appears when the particulate filter has exceeded most of the maximum running distance and serves as information / request for competent filter replacement in the BMW workshop.
  

• Fault 4D4A appears if no measures are taken despite the request for filter replacement being issued and the total running distance of the particulate filter has been exceeded.
  
  

Use

The diesel particulate filter is deployed as follows:

• E60 with M57TÜ/EU4: From 03/04
  
• E60 with M57TÜ TOP/EU4: From 09/04
  
• E65 with M57TÜ2: From 03/05
  
• E60, E83, E90 with M57TÜ2: From 09/05
  
• E70 with M57TÜ2: From 09/06
  
• E70, E90, E83 with M57TÜ2 TOP: From 09/06
  
• All other M57TÜ2 TOP engines: From 03/07
  

See also BMW Technology:

TIS -> Document -> SI Technology -> Enter SBT Number

SBT numbers:

11 01 05124 and 18 02 03062